[SPARK-35600][TESTS] Move Set command related test cases to SetCommandSuite

[gengliangwang]

What changes were proposed in this pull request?

Move Set command related test cases from SQLQuerySuite to a new test suite SetCommandSuite. There are 7 test cases in total.

Why are the changes needed?

Code refactoring. SQLQuerySuite is becoming big.

Does this PR introduce any user-facing change?

No

How was this patch tested?

Unit tests

[SparkQA]

Test build #139166 has finished for PR 32732 at commit 3430609.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
• class SetSuite extends QueryTest with SharedSparkSession with ResetSystemProperties

[SparkQA]

Kubernetes integration test unable to build dist.

exiting with code: 1
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/43686/

[dongjoon-hyun]

Retest this please

[dongjoon-hyun]

+1, LGTM (one minor comment about the test suite naming)

[dongjoon-hyun]

Thank you for update, @gengliangwang .

[SparkQA]

Kubernetes integration test unable to build dist.

exiting with code: 1
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/43693/

[SparkQA]

Test build #139174 has finished for PR 32732 at commit 97d8107.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
• class SetCommandSuite extends QueryTest with SharedSparkSession with ResetSystemProperties

[HyukjinKwon]

Merged to master.